X² + 2x – 1 = 0 in English words.

Mathematics

2 answers:

Svet_ta [14]3 years ago

7 0

Answer:

x squared plus two times x minus one = zero.

Step-by-step explanation:

(This is a Quadratic equation in the variable x).

Doss [256]3 years ago

3 0

Answer:

One less than the sum of square of a number and twice the number is 0

Step-by-step explanation:

$x^2+ 2x - 1 = 0$

x represents any number. x^2 represents square of a number

2x represents twice the number

$x^2+2x$ can be written as sum of square of a number and twice the number

$x^2+2x-1$

One less than the sum of square of a number and twice the number

$x^2+2x-1=0$

One less than the sum of square of a number and twice the number is 0

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Your company manufactures hot water heaters. The life spans of your product are known to be normally distributed with a mean of

Oksana_A [137]

Answer:

You should claim 10.5325 years on your warranty.

Step-by-step explanation:

Problems of normally distributed samples are solved using the z-score formula.

In a set with mean $\mu$ and standard deviation $\sigma$ , the zscore of a measure X is given by:

$Z = \frac{X - \mu}{\sigma}$

The Z-score measures how many standard deviations the measure is from the mean. After finding the Z-score, we look at the z-score table and find the p-value associated with this z-score. This p-value is the probability that the value of the measure is smaller than X, that is, the percentile of X. Subtracting 1 by the pvalue, we get the probability that the value of the measure is greater than X.

In this problem, we have that:

$\mu = 13, \sigma = 1.5$